/**
 *
 *    geo-platform
 *    Rich webgis framework
 *    http://geo-platform.org
 *   ====================================================================
 *
 *   Copyright (C) 2008-2021 geoSDI Group (CNR IMAA - Potenza - ITALY).
 *
 *   This program is free software: you can redistribute it and/or modify it
 *   under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version. This program is distributed in the
 *   hope that it will be useful, but WITHOUT ANY WARRANTY; without
 *   even the implied warranty of MERCHANTABILITY or FITNESS FOR
 *   A PARTICULAR PURPOSE. See the GNU General Public License
 *   for more details. You should have received a copy of the GNU General
 *   Public License along with this program. If not, see http://www.gnu.org/licenses/
 *
 *   ====================================================================
 *
 *   Linking this library statically or dynamically with other modules is
 *   making a combined work based on this library. Thus, the terms and
 *   conditions of the GNU General Public License cover the whole combination.
 *
 *   As a special exception, the copyright holders of this library give you permission
 *   to link this library with independent modules to produce an executable, regardless
 *   of the license terms of these independent modules, and to copy and distribute
 *   the resulting executable under terms of your choice, provided that you also meet,
 *   for each linked independent module, the terms and conditions of the license of
 *   that module. An independent module is a module which is not derived from or
 *   based on this library. If you modify this library, you may extend this exception
 *   to your version of the library, but you are not obligated to do so. If you do not
 *   wish to do so, delete this exception statement from your version.
 */
package org.geosdi.geoplatform.gui.client.widget;

import com.extjs.gxt.ui.client.Style;
import com.extjs.gxt.ui.client.event.ComponentEvent;
import com.extjs.gxt.ui.client.event.ScrollListener;
import org.geosdi.geoplatform.gui.client.widget.toolbar.LayerTreeToolbar;

import javax.inject.Inject;

import static java.lang.Boolean.TRUE;

/**
 * @author Giuseppe La Scaleia - CNR IMAA geoSDI Group
 * @email giuseppe.lascaleia@geosdi.org
 */
public class LayerTreePanel extends GeoPlatformContentPanel {

    private final LayerTreeWidget layerTree;
    private final LayerTreeToolbar treeToolbar;

    /**
     * @param theLayerTree
     * @param theTreeToolbar
     */
    @Inject
    public LayerTreePanel(LayerTreeWidget theLayerTree, LayerTreeToolbar theTreeToolbar) {
        super(TRUE);
        this.layerTree = theLayerTree;
        this.treeToolbar = theTreeToolbar;
    }

    @Override
    public void addComponent() {
        super.add(this.layerTree.getTree());
        super.setTopComponent(this.treeToolbar.getToolBar());
    }

    @Override
    public void initSize() {
    }

    @Override
    public void setPanelProperties() {
        super.setScrollMode(Style.Scroll.AUTOY);
        super.setHeaderVisible(false);

        //This code fix a scroll problem on IE9
        super.addScrollListener(new ScrollListener() {
            int posV = 0;

            /**
             * Fires when a component is scrolled.
             *
             * @param ce the component event
             */
            @Override
            public void widgetScrolled(ComponentEvent ce) {
                if (posV > 9 && LayerTreePanel.super.getVScrollPosition() == 0) {
                    LayerTreePanel.super.setVScrollPosition(posV);
                }
                posV = LayerTreePanel.super.getVScrollPosition();
            }
        });
    }

    @Override
    protected void beforeRender() {
        this.buildComponents();
        super.beforeRender();
    }

    private void buildComponents() {
        this.treeToolbar.buildToolbar();
        this.layerTree.buildTree();
    }

    /**
     * @return the layerTree
     */
    public LayerTreeWidget getLayerTree() {
        return layerTree;
    }
}
